A question for you science-types out there...

If I'm looking at the list of ingredients on a drink, what would be there that would tell me if it's caffeinated? Is it actually called out as "caffeine", or is the caffeine in something else? I realized last night that I haven't the faintest idea if something is caffeinated unless it actually says "caffeine-free" on it, or if it's just water and juice or something similar. This whole caffeine-free lifestyle is going to be a bit difficult, just in terms of find things to drink besides water...

Thanks!